Driving pulley for ropes or chains provided with gripping jaws



A. SCHURIG Dec. 8, i931.

DRIVING PULLEY FOR ROPES 0R CHAINS, PROVIDED WITH GRIPPING JAWS Filed July 11, 1929 Inventor Y .H. ficfiwrig y A. W1

.11 ttorrwy.

Patented Dec. 8, 1931 UNITED STATES PAT EN'TI,

ARTHUR SCHURIG, OF SAAR-BRUGKEN, GERMANY; ASSTGNOR TO-GESELLSCHAET FUR IEORDERAULAGEN ERNST HECKEL MIT BESCHRANKTER HAFTUNG, F SAAB BRUGKEN, GERMANY DRIVING IULLEY FOR ROPES 01 CHAINS rnovrnnn mmem'nme JAws j Y Application filed July 11, 1929, Serial No. 377,543, and in Germany February 1, ,1929.

Driving pulleys for ropes or chains, provided with gripping aws as at present constructed can be used only for low speeds for the reason that the tremendous centrifugal force which is generated at the higher speeds throws the gripping jaws outwards with great force into their position of rest, so that at first a loud rattling noise is produced; furthermore the gripping jaws do not open quickly enough, so that they are ejected from the pulley without engaging in the notches which form their position of rest. Another disadvantage is that the heavy blows of the gripping jaws prematurely wear away the material.

To overcome these disadvantages the gripping aws are provided according to the invention with a buiier device.

This buffer device mayconsist of a known type of buffer operated by air, a liquid or a spring or by any other elastic material; the buifer action may also be producer by the combination of several of the elements mentioned. It is advantageous for the buffer to '55 act radially and for one buffer element to be order to keep the cross-section of the rim of the driving pulley as small as possible, it is advantageous to provide the bufier apparatus outside the rim of the wheel and turned towards the hub. In this case the bufl'er apparatus may be enclosed in known manner in a protective casing so as to protect it from dirt and the like.

The device according to the inventionis diagrammatically illustrated by way of example in the accompanying drawings, the construction selected being one in which an air buffer apparatus is provided within the rim of the driving pulley.

Figure 1 shows the gripping jaws in the operative position, that is to say in the condition in which they are forced inwardly, and

"compressed by the piston 8 escapes through the holes 12 until, after they have been therefore togetheigby the radial, inwardly acting pressure of the rope.

' FigureQ shows the gripping jaws-at the moment at" which the rope ru s ofli'thez'pulley, the gripping jaws are wide. open and the butter apparatus is coming into action.

In'the drawings, 1 denotes the rim of the driving'pulley and 2a pairof gripping jaws;

3 is the butter apparatus, and4 the rope. The

air cylinder 5 .of the'buft'er apparatus?) is r connected tothe' pivot bolt 7 ,ofthegri'pping jaws 2 by means of two'arms 6, while the piston 8 is secured to the rim 1 by means of the rod 9 andthe check nut'l0. j

The b'uiier apparatus operates as follows:

WVhen the rope runs off, the grippingjaws are opened by the spring 11', the cylinderfi moving radially outwards under the additional action'of'centrifugal force; Theair maskedythe 'air bufferql comes into opera; tion, whereby a gentle, braking action'is e'xerted on the gripping jaws. Thebuiferiapparatus can be so adjusted by the check nut7 10 that it' comes into actiononlyw'hri' the gripping jaws are in a particular position,

By speolally arrangingithef' holes 12 the I action of the bufi'er can'b'e accurately determined. This is also possible: whensprin'gs are used, inasmuch as they can be telescoped into each other for example ,to "different lengths."

Another advantage the apparatus according tothe'invention is that the projection 14, whichinthe known secured by the use of I types of apparatus'hold thegrippi'n'g jaws securely in the rim ofthe driving pulley are now superfluous. j j a j I claim A I 1. Driving pulleys for flexible elements,

su'ch'as ropes, provided with gripping jaws operating upon the gripping jaws to brake and: limit the outwardimovement thereoty T1 tween the gripping jaws and the pulley rim, the said bufler devices being on the inner side of the said rim, and a cover enclosing the said buffer devices.

THUR. HU

ley and operating upon the gripping jaws to brake-and limit the outward movement therer- I of:

8. Driving pulleys for flexible elements, i

such as ropes, provided with gripping jaws mounted inthei im of the pull'eycapable-ofmovement in the radial direction relatively to the axis for the purpose ofengaging and r leasing e-flexibl le en and ydrauli bufier apparatus mounted upon. the said pulhay and operatirngfuponthe.gripping jaws to brake .and limit the outward movement therezoi,

L Driving pulleys according. to. claim I 1,

provided with buflfer devices connected to the grippingjaws on the} inner sideand disposed to act the radial i-irection relatively to ,the axisof the pulley. L

. 5.v Driving; pulleys according. to. claim 1,

provided withbu-fler devices comprising two ;f

relatively moving elements, and .means, for constralning the ,re1at1ve, movement,-one. of

thesaid elementsbeing connected to the corresponding grippin-g jawsandthe other to theri-m ofthe dr1v1 n;g;pulley.

" 6. Dri ving .-pulleys according toclaiml,

stTaini-ngihe relative movement of .the said elements, and an adjustableconnection beoif, the pulley-with which it is connected.

7. Driving pulleysaaccordingto claiml, provided with buffer devices.comprisingpisprovided with buffer devices comprising. relatively; movable elements, means. for con.-

..tweenone of-th'e'said elements and the part ton cylinderel-ements, oneof which elei ments is connected to the correspondi'ngzgripping; jawsand the other of whichaelements is connected to the rim of .the pulley.

"8. Drivingpulleys' according to claim 1,

provided with buffer devices comprisingpiston and cylinder elements, one of whichelements isconnected to the' corresponding gripping; jaws and the otherofwhich elements is, connected toqthe rim of the; pulley, and

tionsgso that-the butter-comes into action Only when the gripping jaws are in ardetermined position. v

' Driving pulleys according; to, claim 1, provided with bufler devices comprising .two relatively: movableelements and: means for constraining th-e said relative movement, the

said-: buffer devices being I disposed between the gripping .j aws and the pulley rim- .onE-the innerside of. the --SELld;sIllI1.

10.." Driving pulleys according to claim 1,

:means for adj L stingone of the said connecprovided withzbufiierl devicesconnectedhe- V 

